<template>
    <div class="login_container">
        <div class="login_box">
            <!-- 头像区域 -->
            <div class="avater_box">
                <img src="../assets/logo.png">
            </div>
            <!-- 登录表单区域 -->
            <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
                <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input v-model="loginForm.password" type="password" prefix-icon="el-icon-lock"></el-input>
            </el-form-item>
            <!-- 按钮 -->
             <el-form-item class="btns">
                <el-button type="primary" @click="login">登录</el-button>
                <el-button type="info" @click="resetLoginForm">重置</el-button>
            </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
    export default {
        data(){
            return{
                //这是登录表单的数据绑定对象
                loginForm:{
                    username:'admin',
                    password:'123456'
                },
                //这是表单的验证规则
                loginFormRules:{
                    //验证用户名是否合法
                    username:[
                        {required:true,message:"请输入用户名",trigger:"blur"},
                        {min:3,max:10,message:"用户名在3-10个字符",trigger:"blur"}
                    ],
                    //验证密码是否合法
                    password:[
                        {required:true,message:"请输入m密码",trigger:"blur"},
                        {min:6,max:15,message:"密码在6-15个字符",trigger:"blur"}
                    ]
                }
            }
        },
        methods:{
            resetLoginForm(){
                this.$refs.loginFormRef.resetFields();
            },
            login(){
                this.$refs.loginFormRef.validate(async valid=>{if (!valid) return;
                const {data:res}=await this.$http.post("login",this.loginForm);
                if(res.meta.status!==200) return this.$message.error('登陆失败！');
                this.$message.success('登陆成功！');
                //1.将登陆成功之后的token，保存到客户端的sessionStorage中
                //1.1项目中出了登陆之外的其他API接口，必须在登陆之后才能访问
                //1.2token只应在当前网站打开期间生效，所以将token保存到客户端的sessionStorage中
                console.log(res);
                window.sessionStorage.setItem("token",res.data.token);
                //2.通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push("/home");
                })
            }
        }
    }
</script>

<style lang="less" scoped>
    .login_container{
        background-color: #2b4b6b;
        height: 100%;
    }
    .login_box{
        width: 450px;
        height: 300px;
        background-color: #fff;
        border-radius: 3px;
        position: absolute;
        left:50%;
        top:50%;
        transform:translate(-50%,-50%)
    }
    .avater_box{
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%; 
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        } 
    }
    .login_form{
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;
    }
    .btns{
        display: flex;
        justify-content: flex-end;
    }
</style>